NEW ALBANY, Ind. — Senator Hillary Rodham Clinton’s fund-raising roared to life on Wednesday, with her campaign collecting $10 million in the hours after she won the Pennsylvania primary, and the fresh infusion of cash immediately went to helping her mount a vigorous fight in Indiana, the next primary state.

Senator Barack Obama, relying on an already strong financial advantage, barely mentioned his Democratic rival — or his defeat — as he filmed new television commercials here, reassured superdelegates that he was still the front-runner and deployed scores of campaign workers to Indiana, North Carolina and the half-dozen other states that remain on the primary calendar.

Mr. Obama said Democrats should be concerned that “there’s been some time lost” in turning the party’s focus to Senator John McCain, the presumptive Republican nominee. But he said again and again that Mrs. Clinton was trailing in pledged delegates and the popular vote and that he would fight through the nine remaining contests “to wrap up this nomination as quickly as possible.”

Mrs. Clinton’s overnight fund-raising success, however, gave her the means to compete on a more level field with Mr. Obama. Campaign officials said they raised $10 million in online donations in the 24 hours after her Pennsylvania victory, the campaign’s best one-day money haul. The contributors included at least 70,000 new donors, the officials said.

While Mr. Obama had started April with more than $40 million, Mrs. Clinton’s campaign was essentially broke, with millions of dollars in debt. Her dire financial straits had threatened to derail her campaign before her nine-point victory in Pennsylvania allowed her to make a fresh case to voters and party leaders that she would be the strongest Democratic presidential nominee.

The Clinton campaign was scrambling to milk the jump in contributions, transforming its home page to a donation page, something it had experimented with for several days last month with great success.

Indiana, like North Carolina, holds its primary on May 6. Mrs. Clinton is seeking to replicate her campaigns from Ohio and Pennsylvania to win over voters there who share many similarities and concerns. She arrived in Indianapolis on Wednesday sharply focused on the economy, by far the chief concern of Democratic voters across the country, according to exit polls. She promised that as president she would deliver “jobs, jobs, jobs, jobs” across the Rust Belt, which has seen a severe erosion of manufacturing jobs in recent decades.

A senior Clinton aide said that she would tailor her message in Indiana to appeal to lower-income workers in the cities and to voters in rural areas and small towns.

The aide said Mrs. Clinton would continue to raise questions about Mr. Obama’s readiness to face the many economic and national security challenges facing the country. He did not rule out running some version of an advertisement that the campaign ran in the final days of the Pennsylvania race showing images of the Great Depression, Pearl Harbor and Osama bin Laden and questioning Mr. Obama’s fitness to lead in perilous times.

She has two advertisements on the air in Indiana, both focusing on trade and the loss of jobs.

Her campaign is also circulating fliers in Indiana criticizing Mr. Obama’s health care plan, claiming that it would leave 15 million Americans uncovered, a claim Mr. Obama disputes.

As they campaigned Wednesday in Indiana, Mrs. Clinton and Mr. Obama intensified their vigorous behind-the-scenes fight for superdelegates, with them and their surrogates making calls to win over people who are uncommitted or suddenly unsure of whom to support.

Mr. Obama drew the support of Gov. Brad Henry of Oklahoma, who said squabbling among Democrats would “be disastrous for the party.” A superdelegate from Nebraska also endorsed Mr. Obama, as did a group of supporters of former Senator John Edwards of North Carolina, while Mrs. Clinton received new support from one superdelegate.

Mr. Obama argued that he had made progress in the Pennsylvania primary, despite his defeat. And he sought to play down questions about whether he can win in the general election, claiming that he would draw support from independent voters and Republicans eager for a change in Washington.

“Don’t worry about the party being divided in November,” Mr. Obama told voters in this southeastern Indiana town. “The Democratic Party is going to recognize, as soon as we have a nominee, that there is too much at stake for us to be divided.”

While polls show Mr. Obama comfortably ahead in North Carolina, polls in Indiana indicate that the race is tight, with each candidate enjoying countervailing advantages. Mr. Obama is from neighboring Illinois and is better known in Indiana than in many other states because of the overlap of media markets. Mrs. Clinton begins with a sizable base of middle- and lower-income, less-educated voters that have rallied behind her elsewhere in the Midwest, and she has been working to expand her appeal to higher-income suburbanites, according to party officials here.

Sarann Warner, the vice-chairwoman of the Democratic Party in Hamilton County, in suburban Indianapolis, said there had been a surge in Democratic Party registration in the county, long a Republican bastion.

“Democrats are coming out of the woodwork,” she said, adding that she had no idea whether they were Clinton or Obama supporters. She said she was neutral in the contest.

Kip Tew, a former state Democratic Party chairman who supports Mr. Obama, said 150,000 new voters had registered as Democrats since January. He said Indiana was unique politically and geographically, but more like Ohio and Missouri than Pennsylvania. Mr. Obama narrowly won the Missouri primary while Mrs. Clinton won in Ohio by 10 points. Mr. Tew said that he expected Mrs. Clinton to run strongly in small towns and rural areas.

“It’s hard to predict how they will vote,” he said. “People have consistently underestimated the power of the Clinton brand in Democratic politics.”

Jeff Zeleny reported from New Albany, and John M. Broder from Indianapolis.

A version of this article appears in print on , on page A21 of the New York edition with the headline: Fresh Off Pennsylvania Victory, Clinton Raises Millions, Mostly Online. Order Reprints|Today's Paper|Subscribe